These double fans are designed for vent openings that fall between joists. This is typical in a West Coast or California construction. These fans can be mounted from the inside of the crawlspace to fit between the joists. If necessary, the fans can also be mounted with a cover from the outside when space is particularly tight.

One benefit of internal mounting is that unique or aesthetic vent covers can remain untouched.

If needed, a grill can be provided to cover vent opening.

The fans are either an exhaust fan or an intake fan.

The fans can be powered via low voltage 12V DC cable and power supply or with an AC Adapter for a standard outlet.